Well actually I did not worry about the warning, this particular part
made me worry much more:
Call Trace:
[<ffffffff804a99ce>] ata_eh_set_powersave+0x34e/0x370
[<ffffffff8048c7b0>] scsi_error_handler+0x0/0x330
[<ffffffff804a9e27>] ata_do_eh+0xb7/0x16f0
[<ffffffff80229f9d>] find_busiest_group+0x1bd/0x800
[<ffffffff804aece0>] ahci_postreset+0x0/0x80
[<ffffffff804ada70>] ahci_hardreset+0x0/0xf0
[<ffffffff804aee20>] ahci_softreset+0x0/0x270
[<ffffffff804a40f0>] ata_std_prereset+0x0/0xf0
[<ffffffff8023b134>] lock_timer_base+0x34/0x70
[<ffffffff8048c7b0>] scsi_error_handler+0x0/0x330
[<ffffffff8048c7b0>] scsi_error_handler+0x0/0x330
[<ffffffff8048c7b0>] scsi_error_handler+0x0/0x330
[<ffffffff804abc27>] ata_scsi_error+0x297/0x730
[<ffffffff8048c7b0>] scsi_error_handler+0x0/0x330
[<ffffffff8048c893>] scsi_error_handler+0xe3/0x330
[<ffffffff80229507>] __wake_up_common+0x47/0x80
[<ffffffff8048c7b0>] scsi_error_handler+0x0/0x330
[<ffffffff8024675b>] kthread+0x4b/0x80
[<ffffffff8020a9a8>] child_rip+0xa/0x12
[<ffffffff80246710>] kthread+0x0/0x80
[<ffffffff8020a99e>] child_rip+0x0/0x12
Looks like the kernel complains about a bug or something at this point?!
Because I am not a developer I can't tell for sure, but I don't think
this is all good.
It is printed to dmesg when booting and a second time when enabling the
feature via sysfs.
Peter
John Fremlin wrote:
Peter Ganzhorn <peter.ganzhorn@xxxxxxxxxxxxxx> writes:
I just wanted to have a look at the patch and see if it works for me -
looks like somethings not all straight, I get this while booting:
ahci 0000:00:1f.2: version 2.2
ACPI: PCI Interrupt 0000:00:1f.2[C] -> GSI 19 (level, low) -> IRQ 19
ahci 0000:00:1f.2: nr_ports (3) and implemented port map (0x1) don't match
ahci 0000:00:1f.2: AHCI 0001.0100 32 slots 3 ports 3 Gbps 0x1 impl SATA mode
ahci 0000:00:1f.2: flags: 64bit ncq pm led clo pio slum part
PCI: Setting latency timer of device 0000:00:1f.2 to 64
scsi0 : ahci
ata1: SATA max UDMA/133 cmd 0xffffc20000048100 ctl 0x0000000000000000
bmdma 0x0000000000000000 irq 0
WARNING: at drivers/ata/libata-eh.c:1917 ata_eh_set_powersave()
[...]
I hope this output from dmesg helps to make the patch better - if I
can do any further testing please let me know!
That is fine. The warning is expected. There is nothing wrong with
it.
This patch will stop the ports when they are idle. To turn it on,
echo 1 > /sys/module/libata/parameters/powersave
[...]
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